Lindsay Lohan gave up drugs, but she’s now getting her juice from Vitamin B12 shots. Lohan jetted back from London to host a party at Harrah’s The Pool After Dark in Atlantic City. “She said she was suffering from jet lag and requested that a doctor be on call to administer B12 shots if needed,” said a spy. “Her other demand was two cartons of cigarettes.” Once there, she relaxed in a private cabana with mom Dina and friends. But she criticized the deejay, telling the crowd “a certain ex-girlfriend” could teach him “what songs to play” — a reference to Samantha Ronson.LINDSAY SAYS SHE’S NOT A LESBIAN